A jet airplane is traveling 184 m/s. In each second the engine takes in 68.2 m³ of air having a mass of 70.2 kg. The air is used to burn 2.92 kg of fuel each second. The energy is use to compress the products of combustion and to reject them at the rear of the engine at 497 m/s relative to the plane. Find (a) the thrust of the jet engine and (b) the delivered power (horsepower).

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

11

21

31

41